An experimental study of the adsorption sites of metal adatoms on an oxide surface is presented. The adsorption sites of gold on the ultrathin aluminum oxide grown on NiAl 110 are determined. For the study low-temperature frequency modulation dynamic force microscopy is employed to identify the adsorption sites in real space. Results show that wave trough-like depressions in the alumina surface...

A parallel implementation of an image segmentation transform the watershed algorithm-is presented. The algorithm was implemented using the message passing paradigm, both with PVM and MPI and is adapted to a speciic application of determining the volume of liquor from CT-scans. The algorithm is applied on 2D images from cra-nial CT scans to extract the liquor parts from them. The evaluation on a...

In order to understand the beneficial effect of Pt on the adherence of thermally grown alumina scales, sessile drop experiments were performed to study the wetting of poly-crystalline alumina by nickel-aluminum alloys with or without platinum addition where the amount of Pt ranged from 2.4 to 10 at.%. Subsequent interfacial structure was evaluated using atomic force microscopy. Platinum additio...

Single 4,7,12,15-tetrakis(4'-dimethylaminostyryl)[2.2]paracyclophane molecules adsorb on NiAl(110) in different configurations. When the symmetry axes of the molecules are properly oriented with respect to the surface lattice, three adsorbate states of different conductance can be reversibly induced and directly imaged with a scanning tunneling microscope. Couplings between tunneling electrons ...

Finding prospective high temperature materials for use in advanced coal-fired plants has proven to be an extreme materials challenge. We propose a new methodlogy to predict alloys with high melting temperatures by estimating their formation enthalpies. The Miedema’s approach has been extended to ternary systems using an energy minimization scheme. The power of this approach is demonstrated by c...

Facile nucleation and growth of bilayer Ag(110) islands on NiAl(110) is observed by STM for Ag deposition at temperatures as low as 127 K. Density functional theory analysis for supported Ag films determines adatom adsorption energies (which favor bilayer islands), interaction energies, and diffusion barriers. Analysis of an atomistic lattice-gas model incorporating these energies elucidates th...

The importance of substrate-mediated adsorbate-adsorbate interactions on electronic states has been demonstrated for Au dimers on NiAl(110) with a scanning tunneling microscope and density functional calculations. An unoccupied resonance observed in single Au atoms splits into a doublet in Au dimers. The energy splitting depends inversely on the distance between the two adatoms, revealing the r...

Recently, Heusler ferromagnets have been found to exhibit unconventional anomalous electric, thermal, and thermoelectric transport properties. In this study, we employed first-principles density functional theory calculations systematically investigate both intrinsic extrinsic contributions the Hall effect (AHE), Nernst (ANE), thermal (ATHE) in two ferromagnets: Fe$_2$CoAl Fe$_2$NiAl. Our analy...